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Herald of Pestilence (lore)

From Diablo Wiki

Long ago, the heralds of pestilence were lesser demons who rebelled against Azmodan. The Lord of Sin vanquished them easily, but instead of slaying them, he granted each one a long arm infested with a poison that could kill anything but Azmodan himself. The heralds have been plague-riddled menaces ever since. -- Deckard Cain